Hollow cushion tire



- 54 v e. F. FISHER $1,317,355

HOLLOW CUSHIQN TIRE Original Filed July 10, 192,2

IN VENTOR:

G'zonas/T' HIS/15R BY 2 g 5% v TTORNEY Patented Aug. 4, p 1931 GEORGE F. FISHER,

OF QUINCY, MASSACHUSETTS, .Assxeivonl TO ivr onenna WRIGHT,

or DETROIT, MICHIGAN, A CORPORATION 0F.V1 VIICH'IGAN HOLLOW cUsHIonmiR Original application filed This invention relates to solid tires of the cushion type having a longitudinally extending recess or cavity and secured by vulcanization to a metallic rim. The comprehensive object of the present invention is to provide,

7 a simple and wear resisting hollow cushion tire, which tire is vulcanized to a one piece imperforate type of metallic rim thereby obtaining strength and at the same time having 4) the desirable resiliencyof a cushion or hollow type of solid tire.

This application is a division of my previously filed application from which Patent No. 1,613,697, issued January 11, 1927.

- 5 The specific embodiment of the invention is illustrated in the accompanying drawing 7 in which is shown a transverse sectional view of a tire mounted on itsrim. As illustrated, the tire comprises anannular body portion designated by the numeral'l and provided with an annular cavity 2. The body portion I united together permanently. WllllG this;

is mounted upon an annular base comprised of the two layers of rubber composltlon 3 and 4. The tire composed of base and body ipor- V 5 tion is vulcanized to a metallic rim 5.

In forming the tire, the'base and body portions of the tire are pre-formed separately. /Vhile this may be accomplished various-- ly, a convenient way is to assemble on or about a metallic rim 5, vulcanizable rubber composition 4: of-a suitable nature to bond well to metal, one, fo'r instance, high in sulphur and with preferably apowdered metal, such as aluminum, distributed in the mass. This base portion may be builtup on the rim in any suitable mannenas by winding a strip or strips of stock one or more times around the'rim, or by tubing "the material. Preferably, the hardest composition is located imat 3, located above the same and attaining a thickness approximating the height of the side flanges 6. And preferably, but not necessarily, the base portion has its upper surface inclined upwardly towards the center of its outer periphery. After the base has been formed, it is then vulcanizedin any suitable manner, as by wrapping or by con- July 10, 1922, Serial no. 573,868, I v application-filed Gctober 7, 1926. Serial .No. 139,985.

mediately adjacent the metallic rim and a 'slightly softer'compositio'n, such as indicated.

fining in the sections of a mold (not shown).

now-Patent N 1,e13,697. Divided and this In its preferred embodiment, the rim comprises .ametalli'ccylinder 5 provided with 1 flanges 6, at its edgeswhereby a tire channel is formed in the rim.. The surface of the rim is provided iections 7, to interlock with theilayer of hard i'ubberof'the base. portion of the tire; i The rim is unbroken throughoutitsextent.

'The body portion of he tlre indicated generally at l, is made of vulcanizable rubwith grooved or dove-tailed pro her com ositlon which cures in a softer and more yielding condition than'the. base portion, it being amassedin any suitable manner, f

as-by tubing or plying up a strip. of stock about a form or sectional core (not shown), and given a more or less permanent shape by vulcanizi-ng partiallyor completely, between I the sections of a mold.

-After the base and body portions have been separately formed and vulcanized;

more or, less completely), they are then may be accomplished bygthe appl-icationof heat. with the, tire confined in a mold, it is preferable to employ a f cold or self-curing room temperature to-unite the bottom faces of the side walls of-thei body portion to the upper faces of-the base portion. The cement may be applied to either or both of the opposed surfaces and the parts while seaming them together, as indicateda'tB. It is quite obvious that'the invention is capable of many changes and is not confined to the details specifically disclosed. The form of the cavity in the body portion is obviously variable, likewise the shape and configuration of the metallic rim and the opposed faces of the base and body portions. The internal diameter of the body portion than, the external diameter of areseated. And preferably, the diameter common to the seamed together faces is approximately equal to. the I diameter of the free edgesiof the rim flanges 6, if the rim is provided therewith; But this diameter may be greater or less than that of the free edges it is preferable to exert of the rim flanges, the latter being of particular advantage in concealing the seam from sight and protecting it. When cement is used to unite the parts together, as is the 5 preferred procedure, it is desirable to apply pressure to secure a strong union, and this pressure may be derived from external confining molds or Wrappings, or by making the. body portion of a diameter requiring it to be stretched in order to seat upon the outer periphery of the base portion.

From the foregoing, it will be seen that a tire of great strength has been formed, having the resilience of a hollow cushion tire,

due tothe air entrapped in the cavity of the tire. Such a tire is so constructed as to be securely held by its supporting rim throughoutfthe most severe usage. Since the rim is structurally of substantially equal strength throughout itsextent,"all danger of collapse of thetire from this source is eliminated.

For an understandingof the scope of the invention, reference should be made to the accompanying claim.

Having thus described my invention, What I claim and desire to protect by Letters Patent is:

A unitary cushion tire comprising and arranged in radially outward succession, a metallic base, a layer ofhard rubber composi tion, a layer of softer rubber composition haying sloping outer surfaces meeting at substantially the center thereof, and a tread layer of rubber composition softer than the second mentioned layer and having sloping inner surfaces for engaging the sloping surfaces of thesecond mentioned layer and'centerm the tread layer, there being an inward y open annular air pocket inthe tread layerclosed by the second mentioned layer.

Signedat New York, county of New York, State ofN ew York, this 4th day of October,

GEORGE- F. FISHER. 

